What does this math symbol mean?

Question

http://i12.tinypic.com/4rctxcn.gif

My teacher is asking me to write an expression for what the picture stands for, but I'm hopelessly lost. Help, please?

Answer 1

its sigma
it means the sum of a pattern of numbers from a certain term to another
in this case, it is the sum of the 1st ten terms in the pattern

you can figure out the pattern by finding d (difference) and a1 (the first term) from the equation beside it

Answer 2

The sigma means sum. The n=1 at the top means "From n = 1" the ten at the top mean "to 10"

Read this as The sum of (2n + 1) for n = 1 to 10.

Mathmatically it means

(2*1 + 1) + (2*2 + 1) + (2*3 + 1) + (2*4 + 1) + (2*5 + 1) + (2*6 + 1) + (2*7 + 1) + (2*8 + 1) + (2*9 + 1) + (2*10 + 1) =

3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 = 120

Answer 3

As the other answers have stated, the sigma means to add the terms.

Start with n=1 we get

2(1)+1=3 1st term
2(2)+1=5 2nd term
2(3)+1=7 3rd term
2(4)+1=9 4th term
2(5)+1=11 5th term
2(6)+1=13 6th term
2(7)+1=15 7th term
2(8)+1=17 8th term
2(9)+1=19 9th term
2(10)+1=21 10 term

We end at ten because that is the number at the top of the sigma.

If we analyse our answers we see that that this summation represents how to add "odd" numbers in a sequence. The formula that was given "2n+1" gives and odd number for any value of "n". Now we just add the terms.

3+5+7+9+11+13+15+17+19+21=120

The answer is 120 but the picture stands for the summation of odd values from 3 to 21.

Answer 4

That's a sigma. Basically what it does is turn into a long equation where n is replaced by a different number each time. In your case n starts at 1 and you move up to 10, so it would be (2(1) + 1) + (2(2) + 1) + 2(3) + 1) ect....

Incidentally, the answer is 120.

Answer 5

That Greek capital sigma signifies a series summation, over the range (bottom expression) to (top expression), for the given equation. So this example indicates that you have a total of 10 different values that will be added, solving the equation for each of n=1 through n=10.

Answer 6

This symbol is called Sigma & it is used to add the 'n' number of series.
For your given example substitute n=1 to the expression and after getting the result substitute n=2 and so on up to 10 & then add all the substituted values and you will get the result.

Answer 7

You should be able to work this out, if you know that = is the "equal" sign. An equal sign with a cross through it is the "does not equal" sign. Divide 99 by 11 ... what do you get? ... 9. Right? Divide 945 by 45 ... what do you get? ... 21. Right? Therefore 99 divided by 11 is not equal to 945 divided by 45. Try learning the signs the teacher wants you to learn. They're just shortforms, a lot like the shortforms you use while txt msgg. :-)

Answer 8

n=1,2,3...10 consecutively. ie. n is 1 to 10
For each n, 2n+1
The sigma means sum which means add the expressions together for each n from 1 to 10.

2(1)+1+2(2)+1+2(3)+...+2(10)+1

Answer 9

this symbol is called the sigma. it is used for indication of the sum of a range of values

Answer 10

ferst we know what is about sign ex.mathematics physical or
chemistry there is at every one.
you can search (what is X?) can help you that fined mean